Why has the Community bot's profile pic changed from the beloved MSE logo to this:
A common Identicon? Accident, or conspiracy?
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Way back in the day we started salting Gravatar image URLs, but only for new users. Older users do not have a salted Gravatar URL.
Today we performed a backfill so we can drop an old column
Users.Email which contains an email address only used for this purpose but we didn't take into account that users created prior to August 2013 would not have salted URLs. Community is one of those users.
It's gonna take a little while to unwind the backfill and fix everything correctly!
UPDATE 1 A fix has been approved but I'm not particularly keen on running another backfill network-wide on a Friday afternoon. It'll be run to address the issue with all affected users profile images on Monday morning (UTC).
UPDATE 2 I'm running the backfill here on meta now, after verifying the backfill was successful it'll be on a couple of other smaller sites.
UPDATE 3 Backfill was successful on meta, running on a smaller site now - assuming success, rest of the network is next.
UPDATE 4 Annnnnd we're done. Apologies for the inconvenience folks
Strangely, from the edit profile menu, it looks right (just clicked the "Change picture" button and did not change which one was selected):
Gravatar bug? blame-caching? ... ¯\_(ツ)_/¯